A number of customers prefer the Backspace key to behave this way,
rather than the default 3270-style cursor positioning. We call this
"destructive backspace", and it is available through our keyboard
mapping utility program - uni-KEY.
To change the Backspace key, enter uni-KEY through the 0.K.2.u
panel in uni-SPF. Position the cursor at DBACKSPACE, and press Enter.
When the program prompts you to select the key you wish to map,
press Backspace. Then follow the prompts to exit uni-KEY. To make
the change permanent, use the o.K.3.2 panel to export your keybinds
into the installation directory.